PRIME Minister Julia Gillard's taxpayer-subsidised private car has been caught eight times in six months for traffic offences, but who was behind the wheel?

The offences were listed in official documents detailing MPs' expenses over a six-month period last year and tabled in Parliament.

While other MPs say how the fines were incurred and by whom, Ms Gillard's office referred inquiries to Special Minister of State Gary Gray, whose office passed the matter to the Finance and Deregulation Department.

The department has requested an application under Freedom of Information laws before it will reveal the details.

Under parliamentary entitlement guidelines, MPs are entitled to a private vehicle in addition to use of a ComCar and hire cars.

The rules also allow nominated staff and family members to drive the cars.

The fines listed in the latest departmental expense documents - which lists MPs' claims to July, 2012 - show they were issued between December 2, 2011, and March 10 last year. MPs must pay the fines out of their own pocket, together with a $25 departmental processing fee per fine.

A spokeswoman for Ms Gillard said: "Where incurred, traffic infringement notices are paid by the person responsible with no cost to the taxpayer. The infringements have been paid in full."

Two years ago, Ms Gillard's private-plated, taxpayer-funded car was snapped twice in six months by police.

Ms Gillard said at the time that her partner Tim Mathieson had accepted responsibility for the infringements, which included speeding and going through a red light. But the Prime Minister was far from top of the list in the number of fines her office racked up. Former Labor attorney-general Robert McClelland copped 13 fines. He was unavailable for comment.

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